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TimeMonitor/cxx_main.cpp

This is an example of how to use the Teuchos::TimeMonitor class.

/*
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// Teuchos: Common Tools Package
// Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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#include "Teuchos_Version.hpp"
#ifdef HAVE_MPI
#include <mpi.h>
#endif
using namespace Teuchos;
// Global Timers
RCP<Time> CompTime = TimeMonitor::getNewCounter("Computational Time");
RCP<Time> FactTime = TimeMonitor::getNewCounter("Factorial Time");
// Quadratic function declaration.
double quadFunc( double x );
// Factorial function declaration.
double factFunc( int x );
int main(int argc, char* argv[])
{
std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;
int i;
double x;
#ifdef HAVE_MPI
MPI_Init(&argc, &argv);
#endif
// Apply the quadratic function.
for( i=-100; i<100; i++ ) {
x = quadFunc( (double) i );
(void)x; // Not used!
}
// Apply the factorial function.
for( i=0; i<100; i++ ) {
x = factFunc( i );
(void)x; // Not used!
}
// Get a summary from the time monitor.
#ifdef HAVE_MPI
MPI_Finalize();
#endif
return 0;
}
/* Evaluate a quadratic function at point x */
double quadFunc( double x )
{
// Construct a local time monitor, this starts the CompTime timer and will stop when leaving scope.
Teuchos::TimeMonitor LocalTimer(*CompTime);
// Evaluate the quadratic function.
return ( x*x - 1.0 );
}
/* Compute the factorial of x */
double factFunc( int x )
{
// Construct a local time monitor, this starts the FactTime timer and will stop when leaving scope.
Teuchos::TimeMonitor LocalTimer(*FactTime);
// Special returns for specific cases.
if( x == 0 ) return 0.0;
if( x == 1 ) return 1.0;
// Evaluate the factorial function.
return ( (double) x * factFunc(x-1) );
}